Premature leaf fall starts when the amount of

Auxin increases

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Auxin decreases

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Abscisic acid decreases

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Gibberellic acid decreases

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Solution

The correct option is B
Auxin decreases

In the autumn, auxin levels fall in the leaves causing a layer of cells at the base of the petiole to become more sensitive to rising level of ethene.Ethene causes leaf fall.

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Similar questions

Q. Leaf fall starts, when the amount of _________ decreases.

Q. Match the columns and choose the correct combination.

	Growth Regulator		Action
$(a)$	Abscisic acid	$(1)$	Delays leaf abscission
$(b)$	Ethylene	$(2)$	Inhibits seed germination
$(c)$	Cytokinin	$(3)$	Herbicide
$(d)$	Auxin	$(4)$	Hastens fruit ripening

Q. What are the exact functions of the plant hormones(Auxin,Cytokinins,Gibberellins,Abscisic acid)?

Question 20
The substance that triggers the fall of mature leaves and fruits from plants is

(a) auxin
(b) gibberellin
(c) abscisic acid
(d) cytokinin

Q. State whether the following statements are true or false.
Plant growth is stimulated by the presence of auxins, ethylene, and abscisic acid.

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Premature leaf fall starts when the amount of

The correct option is B Auxin decreases In the autumn, auxin levels fall in the leaves causing a layer of cells at the base of the petiole to become more sensitive to rising level of ethene.Ethene causes leaf fall.

The correct option is B
Auxin decreases

In the autumn, auxin levels fall in the leaves causing a layer of cells at the base of the petiole to become more sensitive to rising level of ethene.Ethene causes leaf fall.